<template>
    <transition>
        <div class="user-center">
            <div class="back">
                <i class="icon-back" @click="back"></i>
            </div>
            <div class="switches-wrapper">
                <switches @switch="switchItem" :switches="switches" :currentIndex="currentIndex"></switches>
            </div>
            <div class="play-btn" ref="playBtn" @click="random">
                <i class="icon-play"></i>
                <span class="text">随机播放全部</span>
            </div>
            <div class="list-wrapper" ref="listWrapper">
              <scroll ref="favoriteList" class="list-scroll" v-if="currentIndex === 0" :data="favoriteList">
                  <div class="list-inner">
                      <song-list @select="selectSong" :songs="favoriteList"></song-list>
                  </div>
              </scroll>
              <scroll ref="playList" class="list-scroll" v-if="currentIndex === 1" :data="playHistory">
                  <div class="list-inner">
                      <song-list @select="selectSong" :songs="playHistory"></song-list>
                  </div>
              </scroll>
            </div>
            <div class="no-result-wrapper" v-show="noResult">
              <no-result :title="noResultDesc"></no-result>
            </div>
        </div>
    </transition>
</template>

<script>
import Switches from 'base/switches/switches'
import Scroll from 'base/scroll/scroll'
import SongList from 'base/song-list/song-list'
import Song from 'common/js/song'
import NoResult from 'base/no-result/no-result'
import { mapGetters, mapActions } from 'vuex'
import { playlistMixin } from 'common/js/mixin'

export default {
    mixins: [
      playlistMixin
    ],
    data() {
        return {
            // 当前是我喜欢听的还是最近听的
            currentIndex: 0,

            switches: [
                {name: '我喜欢的'},
                {name: '最近听的'}
            ]
        }
    },
    computed: {
      noResult() {
        if (this.currentIndex === 0) {
          return !this.favoriteList.length
        } else {
          return !this.playHistory.length
        }
      },

      noResultDesc() {
        if (this.currentIndex === 0) {
          return '暂无收藏歌曲'
        } else {
          return '你还没听过歌曲'
        }
      },

      ...mapGetters([
        'favoriteList',
        'playHistory'
      ])
    },
    components: {
        Switches,
        Scroll,
        SongList,
        NoResult
    },
    methods: {
        // 切换标签
        switchItem(index) {
            this.currentIndex = index
        },

        back() {
            this.$router.back()
        },

        // 添加一首歌曲
        selectSong(song) {
          this.insertSong(new Song(song))
        },

        ...mapActions([
          'insertSong',
          'randomPlay'
        ]),

        // 根据当前是哪个列表随机播放全部
        random() {
          let list = this.currentIndex === 0 ? this.favoriteList : this.playHistory
          
          // 如果列表为空则return
          if (!list.length) {
            return
          }

          list = list.map((song) => {
            return new Song(song)
          })  
          this.randomPlay({
            list
          })
        },

        handlePlaylist(playlist) {
          const bottom = playlist.length > 0 ? '60px' : ''
          this.$refs.listWrapper.style.bottom = bottom
          this.$refs.favoriteList && this.$refs.favoriteList.refresh()
          this.$refs.playList && this.$refs.playList.refresh()
        }
    }
}
</script>

<style scoped lang="stylus" rel="stylesheet/stylus">
  @import "~common/stylus/variable"

  .user-center
    position: fixed
    top: 0
    bottom: 0
    z-index: 100
    width: 100%
    background: $color-background
    &.slide-enter-active, &.slide-leave-active
      transition: all 0.3s
    &.slide-enter, &.slide-leave-to
      transform: translate3d(100%, 0, 0)
    .back
      position absolute
      top: 0
      left: 6px
      z-index: 50
      .icon-back
        display: block
        padding: 10px
        font-size: $font-size-large-x
        color: $color-theme
    .switches-wrapper
      margin: 10px 0 30px 0
    .play-btn
      box-sizing: border-box
      width: 135px
      padding: 7px 0
      margin: 0 auto
      text-align: center
      border: 1px solid  $color-text-l
      color: $color-text-l
      border-radius: 100px
      font-size: 0
      .icon-play
        display: inline-block
        vertical-align: middle
        margin-right: 6px
        font-size: $font-size-medium-x
      .text
        display: inline-block
        vertical-align: middle
        font-size: $font-size-small
    .list-wrapper
      position: absolute
      top: 110px
      bottom: 0
      width: 100%
      .list-scroll
        height: 100%
        overflow: hidden
        .list-inner
          padding: 20px 30px
    .no-result-wrapper
      position: absolute
      width: 100%
      top: 50%
      transform: translateY(-50%)
</style>